I'm not really sure I'd want Gale to have his fate sealed either, though. But I'm probably biased since his whole thing about being clinically depressed and suicidal, self-esteem issues and his "damn you caring about me and making me want to live now" dialogue in the star-gazing scene in act 2 is almost too relatable.
Oh I don't want it either, got a little carried away because talking about Karlach and how unfair her whole situation is can get me a bit salty haha. I just want everyone and especially Karlach to get their good outcomes. And most do already, it's just Karlach (and Astarion).